Generate swagger json oas v3 with comments in existing go app

I have an existing golang API app, and I want to document it with swagger, specifically v3 - that has the cookie feature. I've found go-swagger, swagger-ui, and goas repos/utilities, but I'm kind of stuck. My objective is to generate the swagger.json only through comments, not by manually changing the swagger.yaml/.json file.
I'd appreciate any advice or experience on this one!